Here's why:
* Kepler's Laws of Planetary Motion: One of Kepler's laws states that the square of a planet's orbital period is proportional to the cube of its average distance from the Sun. This means that planets further away from the Sun have longer orbital periods.
* Vast Distance: Neptune is the eighth planet from the Sun and is about 30 times farther away than Earth. This immense distance means it takes much longer for Neptune to complete one full orbit.
Think of it like a race track: A runner on the outer edge of a circular track has to cover a much longer distance than a runner on the inside lane. Similarly, Neptune has to travel a much greater distance around the Sun than Earth, resulting in a much longer orbital period.
